I have usually had a gentle spot in my coronary heart for semi-slick tires, relationship again to the mid-1990s when the Michelin Wildgripper Sprint was my go-to rear for mountain biking. The fantastic middle tread seemed quickly — and was rapidly — and nevertheless the tacky rubber even now supplied astonishing fantastic climbing traction (even in moderate mud!) Meanwhile, its stout cornering knobs gave me all the self confidence I wanted when blasting as a result of corners.
I’ve been on and off (mostly on) the semi-slick bandwagon at any time due to the fact, and it was with this identical feeling of hope that I took supply of IRC’s Boken Doublecross, created with a tubeless-ready 60 TPI nylon casing, an virtually properly clean centre tread, and especially meaty cornering knobs.
In this circumstance, though, the Boken Doublecross is billed as an “aggressive all-ailments gravel tire”, supposedly featuring both of those excellent straight-line speed and protected cornering for demanding occasions like the original Belgian Waffle Trip in southern California, whose 217 km (135 mi) system serves up a brutally varied mix of tarmac, dust fireplace roadways, rocky climbing trails, and straightforward-to-goodness singletrack.
Speed is awesome to have for a blended-terrain event like the Belgian Waffle Trip, but so is traction and casing longevity. Right after all, even the quickest tires are slow when you’re carrying them.
IRC provides the Boken Doublecross exclusively in 700c diameter, but in a few various casing widths — 33, 38, and 42 mm — all with size-distinct tread versions. The 38 mm and 42 mm versions are the most similar to each individual other, with a quite tightly packed center tread matched to a significantly more open up shoulder layout with a double row of staggered L-formed blocks.
In distinction, the 33 mm Boken Doublecross’s center knobs are fairly tightly packed, though nowhere near as sleek as the two larger sized dimensions, and all of the knobs are not only smaller in general, but extra evenly distribute out. It’s so distinctive that it must arguably be a distinctive model altogether, and curiously, IRC’s very own description even indicates as this sort of.
I examined the 38 mm tire listed here. True ordinary weight was 472 g for every tire (just 7 g heavier than claimed), and retail price tag is US$60 / AU$78 / £43 / €50.
Set up was pleasantly easy, with a just-suitable bead diameter that was neither also limited nor as well loose on the wide range of wheels I tried using. Inflation was reasonably uncomplicated with a Topeak JoeBlow Ace DX floor pump in the substantial-volume environment. The casing sealed up nicely, also, keeping restricted with 40 mL of sealant for each tire and certainly zero weeping publish-set up.
I frequently hover around 70-72 kg (153-159 lb) depending on the time of 12 months, and just after a honest little bit of experimentation, I at some point settled on an working stress of 34/35 psi, entrance/rear. Mounted on my reference established of DT Swiss GR1600 Spline 25 aluminum clinchers (24 mm inner width), the genuine calculated tire width was notably outsized at just a hair beneath 41 mm.
We have uncovered an dreadful good deal about rolling resistance and tire construction in the latest years, and the Boken Doublecross’s pretty rigid casing implies that it would not specifically be the speediest around. That is only a person piece of the puzzle, having said that tread design and rubber compounds continue to issue, too. Accurate to IRC’s claims, the Boken Doublecross’s generally easy middle and seemingly quicker-rebounding rubber are impressively effective-emotion on tarmac, retaining speed properly on more durable surfaces in general and offering a notably tranquil roll.
Off-road, that to some degree stiffer casing serves up a small far more of a blended bag. On the one hand, it is tested to be reassuringly strong, sloughing off sharp rocks with negligible fear of pinch-flatting — even at lessen pressures — and practically no sidewall scuffing due to the fact I began testing these in November. Tread wear has been great, far too.
So in terms of tough-floor rolling effectiveness, casing toughness, and tread sturdiness, the Boken Doublecross has a good deal going for it. But where by I identified myself wanting far more was traction.
The more durable compound worked very well on tarmac in phrases of grip, with even the open up shoulder sample giving a amazingly self-confident sense when leaned above, many thanks to the stout knob form and agency rubber. The rounded profile feels normal when switching directions, also. It’s no race slick, of study course, but the on-highway cornering manners have been significantly superior than I’d predicted based mostly on appearances.
Off-street, the Boken Doublecross was additional disappointing. The mix of a somewhat hard compound and minimal centre tread offer only so-so generate and braking traction, specially on looser surfaces. And although that rounded profile and greater-rebound rubber are wonderful on pavement, I discovered them additional apt to slide via corners in its place of confidently biting into the floor like one thing with a additional squared-off shoulder. Dropping the inflation pressure definitely helped with the traction, but it also arrived at the expense of rolling performance.
In fairness to IRC, some of this criticism is thanks to the difficult traction circumstances I have here on the Colorado Front Range, wherever ground conditions are generally extra akin to kitty litter more than concrete than tacky, brown grime. That reported, I have also uncovered all those surfaces to promptly reveal weaknesses in tires that may in any other case be masked on surfaces that inherently provide far more grip.
Even omitting the squared-off profile which is admittedly extra location/ailments-distinct, I’d like to see a suppler casing and improved rubber — maybe even dual-compound rubber — due to the fact that would make this tire a superior performer no make any difference where you are.
Doubling down on the Doublecross?
Irrespective of whether you locate the previously mentioned characterization of the Boken Doublecross’s performance good or detrimental will probably depend seriously on what you price in a gravel tire.
If your main aim is best efficiency, you can unquestionably do greater in this article. The WTB Riddler is nevertheless one particular of my all-time favorites, for illustration, many thanks to its combination of shockingly excellent rolling effectiveness and fantastic grip on combined surfaces. The tacky rubber compound helps the lower-profile heart tread do the job considerably improved than you’d anticipate when climbing or below really hard braking, and the squared-off shoulder tread with that dense array of stout cornering knobs inspires self-confidence when you’re leaned above on loose floor way more than you must be.
But that supple casing is also regarded for offering significantly less-than-stellar puncture protection (nevertheless the most recent formulation is apparently superior), and the rubber wears fairly quickly.
It is a relatively identical tale with a thing like the extremely-common Schwalbe G-One particular Allround. It is speedy and entertaining with a outstanding rubber compound, but also not the most long lasting or longest-long lasting.
This IRC Boken Doublecross, though? It’s not the speediest, and absolutely not the grippiest blended-ailments tire I have made use of. But it is really good on tarmac — certainly much better than I considered it’d be — and when it slides about more on actual gravel than I’d choose, it is also demonstrated to be impressively hard and resilient such that I’m self-assured it would go on to deliver that modest overall performance for much more than a single season of tricky use.
If you’re made of revenue, the choice is easy: go with a person of the options on the marketplace that presents extra outright performance (e.g. the WTB Riddler). But if you want to squeeze a little bit additional out of your tricky-gained dollar and are prepared to give up some outright effectiveness in return for additional toughness and longevity — whilst even now getting pretty good on a vast vary of surface styles — this seems like a fairly good way to go.
For a lot more data, visit www.ircbike.com.